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  Tuning the Electronic Conductivity in Hydrothermally Grown Rutile TiO2 Nanowires: Effect of Heat Treatment in Different Environments

Folger, A., Kalb, J., Schmidt-Mende, L., & Scheu, C. (2017). Tuning the Electronic Conductivity in Hydrothermally Grown Rutile TiO2 Nanowires: Effect of Heat Treatment in Different Environments. Nanomaterials, 7(10): 289. doi:10.3390/nano7100289.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6443-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-57E9-6
Genre: Journal Article

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 Creators:
Folger, Alena1, Author              
Kalb, Julian2, Author              
Schmidt-Mende, Lukas3, Author              
Scheu, Christina1, 4, Author              
Affiliations:
1Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              
2Department of Physics, University of Konstanz, P.O. Box 680, 78457 Konstanz, Germany, ou_persistent22              
3Department of Physics, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany, ou_persistent22              
4Materials Analytics, RWTH Aachen University, Kopernikusstrasse 10, Aachen, Germany, ou_persistent22              

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Free keywords: LIGHT PHOTOCATALYTIC ACTIVITY; SENSITIZED SOLAR-CELLS; BLACK TIO2; ENERGY-LOSS; ELECTRICAL-CONDUCTIVITY; OPTICAL-PROPERTIES; DEFECT CHEMISTRY; DOPED TIO2; ANATASE; NANOPARTICLESScience & Technology - Other Topics; Materials Science; black TiO2; nanowire; conductivity; electron energy loss spectroscopy; oxygen vacancy; defects;
 Abstract: Hydrothermally grown rutile TiO2 nanowires are intrinsically full of lattice defects, especially oxygen vacancies. These vacancies have a significant influence on the structural and electronic properties of the nanowires. In this study, we report a post-growth heat treatment in different environments that allows control of the distribution of these defects inside the nanowire, and thus gives direct access to tuning of the properties of rutile TiO2 nanowires. A detailed transmission electron microscopy study is used to analyze the structural changes inside the nanowires which are correlated to the measured optical and electrical properties. The highly defective as-grown nanowire arrays have a white appearance and show typical semiconducting properties with n-type conductivity, which is related to the high density of oxygen vacancies. Heat treatment in air atmosphere leads to a vacancy condensation and results in nanowires which possess insulating properties, whereas heat treatment in N-2 atmosphere leads to nanowire arrays that appear black and show almost metal-like conductivity. We link this high conductivity to a TiO2-x shell which forms during the annealing process due to the slightly reducing N-2 environment.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000414916100007
DOI: 10.3390/nano7100289
 Degree: -

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Title: Nanomaterials
Source Genre: Journal
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Publ. Info: Basel, Schweiz : MDPI
Pages: - Volume / Issue: 7 (10) Sequence Number: 289 Start / End Page: - Identifier: Other: 2079-4991
CoNE: /journals/resource/2079-4991